共查询到19条相似文献,搜索用时 62 毫秒
1.
介绍了一种电容式微Si加速度计的基本结构以及静电激振法用于电容加速度计动态参数测试的基本原理。提出了在开环条件下,采用静电激振法对该类型电容加速度计动态参数测试的电路方案。通过分析获得了扫频特性曲线和阶跃响应曲线,得到了传感器的固有频率、阻尼比。试验结果表明,采用静电激振法得到的结果与传感器设计值比较接近。可以认为,开发的动态参数测试系统是快速且有效的。 相似文献
2.
3.
4.
5.
微硅型扭摆式加速度计的动态分析 总被引:1,自引:0,他引:1
详细分析了微硅型扭摆式加速度计的动态行与阻尼,谐振频率的关系,阐述了扭摆加速度计的阻尼机理,提出了在再平衡反馈回路中加入低通滤波器以调整加速度计性能的方法。 相似文献
6.
7.
8.
9.
分析了谐振式微机械加速度计的工作机理,提出了一种新颖的硅基双轴谐振式微机械加速度计的结构形式。该结构采用一个质量块敏感两个正交方向的加速度,设计的弹性支撑结构巧妙地实现了正交方向的解耦,且结构稳定性好。用MATLAB软件分析了结构参数对性能指标的影响,用ISIGHT软件优化出结构参数,用ANSYS仿真软件对结构进行了静态分析和模态分析,验证了提出结构的设计思想和优化参数的可行性,设计了可实现的工艺流程。 相似文献
10.
当前流行的硅基做加工技术主要有体微加工(bulkmieromachining)和表面做加工(sutheemic。achini。)两种。它们之间的主要区别为:前者将微机械的运动部件制作在硅衬底里,后者则将微机械运动部件制作在硅衬底表面上的薄膜里”健体微加工技术目前用体微加工技术制作的主要产品有:某些压力传感器、加速度传感器。微泵、微阀、微沟槽等微传感器、微机械和微机械零件等,这些产品的微结构的显著特点是它们都有可运动的悬臂梁或桥、可振动的膜或硅衬底里的沟槽。这些微结构的形成主要利用腐蚀技术和光刻技术相结合,有选择地从硅衬底上挖去… 相似文献
11.
12.
Bulk-Silicon Resonant Accelerometer 总被引:6,自引:1,他引:6
Resonant accelerometer is designed,which includes two doubleended tuning forks,a proof mass,fourleverage system amplifying inertial force,and drive/sense combs.Each tuning fork is electrostatically actuated and sensed at resonance using comb electrodes.The device is fabricated using MEMS bulk-silicon technology,whose sensitive degree is 27.3Hz/g,and the resolution is 167.8μg. 相似文献
13.
本文设计了一种新型硅基MEMS集成光强调制型光波导加速度传感器,在同一 集成了分束器、悬臂梁、质量块、光波导、光探测器等元件,解决了光纤传感器向微型化发展时遇到的装配困难及长期稳定性差等问题,讨论了利用现有工艺在硅基片上实现MEMS集成光波导加速度传感器的可行性。 相似文献
14.
Dong Linxi Chen Jindan Yan Haixia Huo Weihong Li Yongjie Sun Lingling 《半导体学报》2009,30(3):034008-034008-6
The comb capacitances fabricated by deep reactive ion etching (RIE) process have high aspect ratio which is usually smaller than 30 : 1 for the complicated process factors, and the combs are usually not parallel due to the well-known micro-loading effect and other process factors, which restricts the increase of the seismic mass by increasing the thickness of comb to reduce the thermal mechanical noise and the decrease of the gap of the comb capacitances for increasing the sensitive capacitance to reduce the electrical noise. Aiming at the disadvantage of the deep RIE, a novel capacitive micro-accelerometer with grid strip capacitances and sensing gap alterable capacitances is developed. One part of sensing of inertial signal of the micro-accelerometer is by the grid strip capacitances whose overlapping area is variable and which do not have the non-parallel plate's effect caused by the deep RIE process. Another part is by the sensing gap alterable capacitances whose gap between combs can be reduced by the actuators. The designed initial gap of the alterable comb capacitances is relatively large to depress the effect of the maximum aspect ratio (30 : 1) of deep RIE process. The initial gap of the capacitance of the actuator is smaller than the one of the comb capacitances. The difference between the two gaps is the initial gap of the sensitive capacitor. The designed structure depresses greatly the requirement of deep RIE process. The effects of non-parallel combs on the accelerometer are also analyzed. The characteristics of the micro-accelerometer are discussed by field emission microscopy (FEM) tool ANSYS. The tested devices based on slide-film damping effect are fabricated, and the tested quality factor is 514, which shows that grid strip capacitance design can partly improve the resolution and also prove the feasibility of the designed silicon-glass anodically bonding process. 相似文献
15.
The comb capacitances fabricated by deep reactive ion etching (RIE) process have high aspect ratio which is usually smaller than 30 : 1 for the complicated process factors, and the combs are usually not parallel due to the well-known micro-loading effect and other process factors, which restricts the increase of the seismic mass by increasing the thickness of comb to reduce the thermal mechanical noise and the decrease of the gap of the comb capacitances for increasing the sensitive capacitance to reduce the electrical noise. Aiming at the disadvantage of the deep RIE, a novel capacitive micro-accelerometer with grid strip capacitances and sensing gap alterable capacitances is developed. One part of sensing of inertial signal of the micro-accelerometer is by the grid strip capacitances whose overlapping area is variable and which do not have the non-parallel plate's effect caused by the deep RIE process. Another part is by the sensing gap alterable capacitances whose gap between combs can be reduced by the actuators. The designed initial gap of the alterable comb capacitances is relatively large to depress the effect of the maximum aspect ratio (30 : 1) of deep RIE process. The initial gap of the capacitance of the actuator is smaller than the one of the comb capacitances. The difference between the two gaps is the initial gap of the sensitive capacitor. The designed structure depresses greatly the requirement of deep RIE process. The effects of non-parallel combs on the accelerometer are also analyzed. The characteristics of the micro-accelerometer are discussed by field emission microscopy (FEM) tool ANSYS. The tested devices based on slide-film damping effect are fabricated, and the tested quality factor is 514, which shows that grid strip capacitance design can partly improve the resolution and also prove the feasibility of the designed silicon-glass anodically bonding process. 相似文献
16.
讨论了一种抗大过载 (15 0 0 0 0 g)的微型加速度计 ,主要内容包括 :阐述加速度计的工作原理 ;设计一种新型十字梁的器件结构 ,并对这种结构进行抗大过载的冲击实验 ,以验证这种新型的结构对于大过载冲击的可靠性 ;进而利用ANSYS对器件进行模态分析 ,找出结构上应变最大的位置 ,并对结构尺寸进行优化 ;提供一种可能的电路版图说明 ,并对加速度计的灵敏性进行理论分析 ;最后提供一种可行的加工工艺方法 相似文献
17.
提出了一种具有"8悬臂梁-质量块"结构的新型三明治式硅微机械电容式加速度计,用微机械加工工艺在(111)硅片上制作出了具有信号输出的器件.该加速度计的惯性质量块由同一(111)硅片上下表面对称分布的8根悬臂梁支撑.这些悬臂梁是利用(111)硅在KOH溶液中的各向异性腐蚀特性结合深反应离子刻蚀(DRIE)实现的,其尺度精确可控,保证了结构的对称性.该加速度计的谐振频率为2.08kHz,品质因子Q为21.4,灵敏度为93.7mV/g. 相似文献
18.
为弥补多媒体教学中激光笔的不足,提出了一种基于微加速度计的无线教鞭系统,它不仅具有激光笔上下翻页的功能,而且能在空中自由灵活移动实现高精度点击的功能,该系统以微加速度计ADXL345作为信号检测元件,并采用低功耗低成本微控制器AT89S52和RF芯片nRF24L01进行信息处理与无线传输,符合人体工程学设计,最大限度地满足人们使用鼠标时在手感以及舒适度和使用习惯方面的要求。 相似文献
19.
一种谐振式微加速度计的设计 总被引:1,自引:0,他引:1
提出一种基于谐振原理、电容检测的微型加速度计。通过外加加速度使质量块经杠杆将力放大施加到谐振器上,改变谐振梁上的轴向应力,从而改变谐振梁的振动频率。研究表明这种加速度计的测量范围达66 g。同时采用有限元法进行了仿真模拟,结果显示传感器灵敏度约18 Hz/g,工作模态固有频率为625.981 kHz。 相似文献